ethyl 7-aminothionocarbonyl-3-benzyloxy-5-methyl-4-oxo-4,5,6,7-tetrahydropyrazolo[1,5-a]pyrazine-2-carboxylate 在
氢溴酸 作用下,
以
甲醇 、
溶剂黄146 为溶剂,
反应 2.0h,
生成 ethyl 3-hydroxy-5-methyl-7-(4-methyl-1,3-thiazol-2-yl)-4-oxo-4,5,6,7-tetrahydropyrazolo[1,5-a]pyrazine-2-carboxylate